Abstract: - This article shows the weighted average capital cost being dynamically modeled. The model includes entry independent variables that can be freely modeled (inflation, financial stability, Central Bank rate, expected profitability of banks, tax rate, risk-free interest rate, beta coefficient) as well as dependent ones (cost of foreign capital, cost of equity, corporate and sectorial risk). The model was created within the program VENSIM. The contribution of this model lies in its dynamics. Examples were used to simulate a regular increase/decrease in equity, which reflected an increase/decrease in WACC. Thus, these examples demonstrate the fact that the cost of equity is more expensive than the cost of foreign capital.